My boyfriend doesn't tell me when something is bothering him

He keeps things inside and keeps his distance for a while than comes around. It really annoys me. He isn't very open in general and say's that he want to deal with his problems on his own. He is always honest with me but isn't straight forward.

But how can I know what is bothering him when he doesn't tell me! Its hard because I am the same way to, I have trouble opening up and this is our biggest problem (honest with each other but not direct)

Any suggestions?
My boyfriend doesn't tell me when something is bothering him
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